05 JUNE 2017 - BANGKOK, THAILAND: A tai-chi class for adults in Lumpini Park in Bangkok. Thai health officials estimate that about 17% of Thais are 60 years old and older, putting Thailand right on the cusp of being an aging society. Many public health centers and government offices in Thailand offer free exercise classes for Thai seniors in an effort to keep older Thais healthy and mobile. PHOTO BY JACK KURTZ